From the look of it, the only to gain from telling them is probably trust. Mathilde telling them what would be a controversial truth is a show of faith from her part.
Mathilde would get access to all the information that the thread is using to debate the issue, ideally. Spymistress digging into secrets. Please remember, we know a bunch, she doesn't. Because we were in her head when she saw the chaos dwarfs, and there was no recognition.
Yes, strategically, it's valuable, but we have no way of acting on it because they're so far away from us and have a buffer zone only slightly less impassable than the Chaos Wastes between the Old World and any way to actually hit them. (And they're not making more Black Orcs nowadays either)
Definitely OOC info to lessen the urgency of the info.
I mean, are you SURE they don't have a peak in K8P?
If Dwarfs cannot avenge a grudge, it's an anchor on them, and that's exactly what you're proposing giving them--a Grudge they can't avenge.
I'm honestly not sure if this line of argument is ooc for Mathilde or not. What would common knowledge on dwarf grudges be, and how common is the knowledge that the empire is declining largely due to grudges? IE, how likely is it for a stirlander mostly on the outside of the grey order's info networks to know that not giving a dwarf info on a grudge is an act of mercy?
You're the one who's misunderstanding the Dwarven mindset.
So, this misunderstanding is likely to be a common one for humans to make? ...I'm not sure how far you are shading your opinion as fact here, also.
The possessed by Mork bit is super concerning that I'm not totally okay with telling our Grey Wizard bosses about since that's just not a good look at all.
Kinda agreed: if we do vote to keep silent here than im probably going to vote to keep silent to the grey wizards: high risk plus consistencey of reasoning in character.
But.
I think Mathilde should be concerned about being possessed. I think she should be worried and self-doubting after the experience of being puppeted, and paranoid that now that Mork has touched her once, he could do it again with little to no notice. I think that she should be looking for someone who knows protective magics and godly lore to ask for help.
So I think that going to Kragg because she is worried about the same things he, or the grey order, would worry about due to possession. And Kragg may be able to help.
There's nothing inevitable or necessary about people making large threads unpleasant to read through. Disagree with my vote all you like, but if the tone of a thread is getting bad then there's every reason to try and stop that from happening.
